So I made an icosahedron out of BB ply. It involved a lot of sanding.
So, turns out sanding precisely is hard. I built a series of small boxes to hold the piece at the correct angles, and it got really close to good, and then I said “oh I’ll just clean it up a little freehand.” Bad plan.
Next time (if I do a next time) I’ll get more serious about sanding jigs to get it exact.
Still, as a proof of concept, this is kind of cool.